Perceptual quality (MSSIM) of the proposed scheme and Tsai
for different modalities.
(a) CT, (b) MR, (c) X-ray, and (d) DSA. (Here, N
= 5 and the no. of images in different modalities are: CT = 84, X-ray = 41, MR = 195, DSA = 12. Image sizes are shown in total no. of pixels) .